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TEA2028 Datasheet(PDF) 4 Page - STMicroelectronics |
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TEA2028 Datasheet(HTML) 4 Page - STMicroelectronics |
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4 / 47 page  II - MAIN FUNCTIONS - Detection and extraction of line and frame syn- chronization pulses from the composite video signal. - Horizontal scanning control and synchronization by two phase-locked loop devices. - Video identification. - 50 or 60Hz standard recognition for vertical scan- ning. - Generation of a self-synchronized frame saw- tooth for 50/60Hz standards. - Line time constant switching for VCR operation through an input labeled ”VCR” (Video Cassette Recorder). - Control and regulation of a primary-connected switching power supply by on-chip controller de- vice combining : • an error amplifier • a pulse width modulator synchronized on line frequency • a start-up and protection system - Overall TV set protection input - Frame blanking and super sandcastle output sig- nals - Frame blanking safety input for CRT protection in case of vertical stage failure. III - PIN CONNECTIONS Pin Description 1 Horizontal output monostable capacitor 2 Frame blanking safety input 3 Frame saw-tooth output 4 Frame blanking output 5 Frame ramp generator 6 Power ground MISCELLANEOUS FUNCTIONS SYNC SEPARATOR HORIZONTAL TIME BASE VERTICAL TIME BASE HORIZONTAL POWER AMP. VERTICAL POWER AMP. SMPS CONTROLLER TEA2028B Miscellaneous Power Supplies PRIMARY CONNECTED SMPS Miscellaneous Power Supplies Mains Input Video Signal UHF I.F. SEPARATOR SOUND I.F. PICTURE I.F. SOUND DETECTION PICTURE DETECTION UHF COLOR DECODING Figure 1 Pin Description 7 SMPS control output 8 Supply voltage (VCC) 9 SMPS regulation input 10 Horizontal output 11 Super-sandcastle output 12 Horizontal flyback input 13 Horizontal saw-tooth generator 14 Current reference 15 SMPS soft-start and safety time constant capacitor 16 φ2 phase comparator capacitor (and horizontal phase adjustment) 17 VCO phase shift network 18 VCO output 19 VCO input 20 Frame sync time constant adjustment capacitor 21 Substrate Ground 22 φ1 phase comparator capacitor 23 VCR switching input 24 Video and 50/60Hz identification output (Mute) 25 Video identification capacitor 26 Horizontal sync detection capacitor (50% of peak to peak sync level) 27 Video input 28 Safety input Package : DIP28 TEA2028 - TEA2029 APPLICATION NOTE 4/46 |
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